When I reached the till point the light came on to indicate an open till point

When I reached the till point the light came on to indicate an open till point. I then went to a different open till point. The cashier then started complaining to another cashier in Zulu about me not going to the till point the light had indicated to go to. I speak Zulu and then asked the cashier in Zulu what 5he problem or the difference was. She neither bothered to reply nor did she greet me at all. She was extremely rude for no reason.